﻿using System;
using static System.Console;

class Program
{
    static void Main()
    {
        WriteLine("hello world");
        int temp = 0;
        temp = Convert.ToInt32(ReadLine());
        object o = temp;
        switch(o)
        {
            case null:
                WriteLine("const pattern with null");
                break;
            case int y when y > 32:
                WriteLine("Type pattern with condition");
                //C#的switch是不允许省略break来实现贯穿的 即fall through
                //对于常量模式 可以用goto语句实现贯穿，对于其他模式好像不太行
                goto case "hello";
                break;
            //x 这里说在C#9以上才能使用类型模式 所以这里加了一个x才能编译通过
            case int x:
                WriteLine("Type pattern without condition");
                break;
                break;
                //这里也一样 在当前7.3里不让省略b C#9里应该可以
            case Book b:
                WriteLine(b.Author);
                break;
            case "hello":
                WriteLine("this is an exact num");
                break;
             default:
                WriteLine("hel");
                break;

        }
    }
    internal class Book
    {
        public Book(String title) => Title = title;
        public String Title { get; set; }
        public String Author { get; set; }
    }
}
